refactor(cli): Simplify flag implementation using inverted add_invertible_flag

Author: null-dreams

mypy/main.py

@@ -998,6 +998,13 @@ def add_invertible_flag(
         help="Do not colorize error messages",
         group=error_group,
     )
+    add_invertible_flag(
+        "--no-pretty",
+        default=True,
+        dest="pretty",
+        help="Disable pretty error message",
+        group=error_group,
+    )
     add_invertible_flag(
         "--no-error-summary",
         dest="error_summary",
@@ -1018,15 +1025,6 @@ def add_invertible_flag(
         dest="many_errors_threshold",
         help=argparse.SUPPRESS,
     )
-    error_group.add_argument(
-        "--no-pretty",
-        action="store_false",
-        dest="pretty",
-        help="Disable pretty error messages (pretty is now the default).",
-    )
-    error_group.add_argument(
-        "--pretty", action="store_true", dest="pretty", help=argparse.SUPPRESS
-    )
 
     incremental_group = parser.add_argument_group(
         title="Incremental mode",